2010 Stormwater Management Report (PDF) - US Environmental ...

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3.0 STORMWATER MANAGEMENT ACTIVITIES The Stormwater Management Program consists of a variety of programs, activities, and best management practices aimed at preventing the discharge of pollutants to storm drains and receiving waters. These measures include maintenance, structural, managerial, regulatory, and educational programs. Key elements of the Commission’s Stormwater Management Program and Stormwater Management Plan implementation are described in this section. 3.1 OPERATION AND MAINTENANCE OF STRUCTURAL CONTROLS Combined sewer overflows, sanitary sewer overflows, sewage infiltration into storm drains and system backups can be prevented by maintaining the capacity and structural integrity of the sewerage and drainage systems. The Commission accomplishes this by cleaning, repairing or replacing sanitary and combined sewers and storm drains, separating combined sewers, and by preventing and removing infiltration and inflow to the sewer system. To determine where structural deficiencies exist and where repairs are needed the Commission performs television inspections of sewers and drains. Since the Commission’s inception in 1977, major sewer system improvements have resulted in increased system capacity and the virtual elimination of dry weather overflows from combined sewers into Boston Harbor and the Neponset, Charles, and Mystic Rivers. Over the last several years, the Commission has completed major sewer separation projects under the court ordered MWRA CSO Plan. Separation work has been completed in Dorchester, in the Stony Brook area of Jamaica Plain, in the Constitution Beach area of East Boston, and most recently, in the Fort Point Channel area in South Boston. A major project recently completed by the Commission is the Morrissey Boulevard Drainage Conduit (MBDC) project. The MBDC project was undertaken by the Commission on behalf of the Massachusetts Water Resources Authority in conjunction with the Authority’s North Dorchester Bay CSO Storage Tunnel (NDBST) Project. The MBDC currently collects stormwater flows from Morrissey Boulevard and its side roads, and conveys it to Dorchester Bay. Most of the stormwater discharges to the MBDC are treated by particle separators that were constructed on storm drains serving businesses along Morrissey Boulevard. The new particle separators are owned and maintained by the owners of the properties where they are located. Once MWRA completes the NDBST Project, stormwater flows from the recently separated area tributary to 18L087 generated from smaller storms will be conveyed to the 3 - 1
NDBST and to Deer Island to be treated, while stormwater flows generated from very large storms will be directed to the MBDC. This will allow for the elimination of outfall 18L087 located near Mother’s Rest in 2011. a. Storm Drain and Sewer Maintenance by BWSC Staff The Commission’s Operations Division is responsible for smaller sewer and drain related repair, maintenance and cleaning jobs, as well as some television inspections of sewers and drains. In 2010, the Commission jetted, vactored or rodded 631,506 linear feet of pipe. In 2010, the Commission owned five (5) “vactor” high-pressure cleaning trucks to clean accumulated materials from sewers and drains, six (6) jet trucks, one (1) multi-rodder truck, and two (2) hydraulic bucket machines to clear blockages. To determine where structural deficiencies exist and where repairs are needed, the Commission crews performed television inspections of 26,790 linear feet of sewer and drain pipe in 2010. In conjunction with the storm drain and catch basin cleaning programs, the Commission routinely clears debris from eleven (11) brook inlets and outlets throughout the City. Since the primary purpose of this practice is to prevent upstream flooding, the cleaning is typically performed immediately prior to major storm events and usually they are checked after storm events to determine if follow up cleaning is needed. The locations and frequency of cleaning is provided in Table 3 – 1. b. Catch Basin Maintenance The Commission has approximately 31,752 catch basins in its sewer and drainage systems. Other catch basins in the city are owned by other public agencies such as the state Department of Conservation and Recreation, Mass Department of Transportation, or are located on private property. The Commission currently owns six (6) clamshell trucks. Commission forces have been supplemented by contract forces and equipment since 2001. Under the current citywide catch basin cleaning contract the contractor is instructed to inspect all Commission owned catch basins, and clean any basin containing at least two feet of sediment. Contractors typically complete two passes through the city each year cleaning basins as directed by the Commission. In 2010, Commission and contract forces performed 11,483 catch basin cleanings. Catch basin cleanings are currently transported to the Materials Handling Facility on Alford Street, where they are temporarily stored until transferred to an approved landfill. An estimated 7,451 tons of material taken from sewers, drains and catch basins was transferred by the Commission’s contractor in 2010. It is not known how much of the material transported was just from the catch basins, although it is believed to be a majority of the amount. 3 - 2
Page 1: 2010 Stormwater Management Report B
Page 6 and 7: TABLE OF CONTENTS (cont.) 5.0 PROGR
Page 8 and 9: 1.0 INTRODUCTION 1.1 PERMIT HISTORY
Page 10 and 11: oadways, roadway maintenance, const
Page 12 and 13: Table 1-1 BWSC Stormwater Outfalls
Page 14 and 15: Table 1-2 Drainage Areas to Outfall
Page 16 and 17: 2.0 ILLEGAL CONNECTION REMEDIATION
Page 18 and 19: Because upstream contamination sour
Page 20 and 21: Table 2-1 Drainage Area Investigati
Page 22 and 23: Table 2-1 Drainage Area Investigati
Page 24 and 25: The Commission estimates the wastew
Page 26 and 27: January 2011 BOSTON WATER AND SEWER
Page 28 and 29: January 2011 BOSTON WATER AND SEWER
Page 32 and 33: Table 3 - 1 Brook Inlet and Outlet
Page 34 and 35: Table 3 - 2 BWSC Particle Separator
Page 36 and 37: 3.2 CONTROL OF NON-STORMWATER DISCH
Page 38 and 39: Table 3 - 3 Spill/Dumping Response
Page 40 and 41: Table 3 - 3 Spill/Dumping Response
Page 42 and 43: g. Yard Waste/Composting The Boston
Page 44 and 45: In 2010, the Commission approved 18
Page 46 and 47: Table 3 - 4 Private Infiltration De
Page 48 and 49: Table 3 - 5 Privately Installed Par
Page 50 and 51: and that negative impacts to stormw
Page 52 and 53: The composition of the material swe
Page 54 and 55: The Catch Basin Stenciling Program
Page 57 and 58: Vincent G. Mannering, Executive Dir
Page 63 and 64: The City of Boston’s dog fouling
Page 65: DON’T DUMP! A catch basin dumping
Page 69 and 70: 5.0 PROGRAM MODIFICATIONS Numerous
Page 71 and 72: 6.0 FINANCING STORMWATER MANAGEMENT
Page 73 and 74: These costs do not include the cost
Page 75 and 76: 8.0 WATER QUALITY IMPROVEMENTS The
Page 77 and 78: 9.0 ASSESSMENT OF STRUCTURAL CONTRO
Page 79: Table 9 - 1 2010 Particle Separator

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